Sewer vent-box.



T. P. MOORE.

SEWER VENT BOX.

APPLIOATION FILED MAR. 2, 1911.

Patented May 16, 1911.

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UNITED STATES PATENT OFFICE.

THOMAS P. MOORE, 0F READING, PENNSYLVANIA, ASSIGNOR TO ABRAHAM LINCOLNFRAME, OF READING, PENNSYLVANIA.

SEWER VENT-BOX.

To all whom t 'may concern:

Be it known that I, THOMAS P. MooRn, a citizen of the United States,residing at Reading, in the county of Berks and St-ate of Pennsylvania,have invented certain new and useful Improvements in Sewer Vent- Boxes,of which the following is a specilication.

This invention relates to improvements in sewer vent boxes and theobject is to provide a vent box of comparatively simple construction andto the interior of which access may easily be had.

The invention is more fully described in the following specification andclearly illustrated in the accompanying drawing, in which:

Figure 1 is a vertical, central sectional view. F ig. 2 is a plan viewof my vent box.

The numeral 1 designates the sewer pipe connection. This connection isformed with an external thread 2.

The numeral 3 designates the inner casing, and this casing is formedwith a series of buttons 4 on its inner surface, which buttons areadapted to be engaged by the convolutions of the thread 2 when themember 1 is screwed into the casing 8. The member 3 is also formed withtwo pairs of lugs 5 near its upper end, at diametrically oppositepoints, and two like pairs of lugs 5a near the lower end and in verticalalinement with the upper lugs. The lower lugs are slightly longer thanthe upper ones.

The casing is formed at its upper end with an inwardly curved flange 6,forming a central opening 7 at the top of the casing.

The numeral 8 designates the outer casing. This is formed with a pair ofinternal lugs 9, each of which is adapted to enter the space betweent-he upper lugs 5 of the inner casing; near the lower end of the casing8 a second pair of like lugs 9"L is formed, which in turn are adapted toenter the spaces between the lugs 5a.

The lugs 9 and 9a are preferably formed with tapered side walls, so thatthey will wedge between the lugs 5 and 5a when in position as shown inFig. 1.

The upper end of the casing 8 is formed Specification of Letters Patent.

.Application filed March 2, 1911.

Patented May 16, 1911.

serial No. 611,746.

with a flange 10 and is slightly enlarged, and in this enlarged portionI place a cover plate 11. This plate is provided with a locking tongue12 adapted to enter an opening 13 in the wall of the casing 8, and at apoint directly opposite the tongue, I provide a fastening screw 14 bymeans of which the plate is secured in the casing.

The cover plate is perforated, as indicated by numeral l5, and to theunder side thereof, at the center, I secure a dome 16, held in positionby means of a bolt 17, and this dome extends over the upper end of theinner casing 3, so that any water or soil entering the perforations inthe cover plate will be shed around the inner casing and will not enterit. i

It is evident that the venting of the sewer to which my vent box isattached will be free, and that to secure access to the inside of thevent box, it will be only necessary to remove the screw 14 and the covermay be removed, together with the dome.

Having thus fully described my invention, what I claim and desire tosecure by Letters Patent is:

In a vent box for sewers, the combination with a sewer pipe connectionthreaded externally, an inner casing formed with an inwardly liangedupper end, internal buttons arranged to engage the convolutions of thethread on the pipe connection and four pairs of diametrically oppositelugs on its outer surface, of an outer casing formed with registeringlugs adapted to enter the spaces between the pairs of lugs on the innercasing, a perforated cover plate for the outer casing, said plate havinga locking tongue adapted to engage the casing and means for securing thecover plate to the casing, and a dome secured to the under side of thecasing adapted to cover the upper open end of the inner casing.

In testimony whereof I aiiix my signature, in presence of two witnesses.

THOMAS P. MOORE.

Witnesses:

ED. A. KELLY, CLARA E. YOUNG.

Copies of this patent may be obtained for ve cents each, by addressingthe Gommissoner of Patents,

Washington, D. C. i

